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Data Retrieval Lab
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A lab that studies information retrieval using machine learning.
AboutAbout the lab
Working on research in information retrieval
The Knowledge Acquisition System Lab (KASYS) studies information retrieval.
Within information retrieval, its main subjects are retrieval models and ranking, learning to rank, analysis of search user behavior, and recommender systems.
Much of its research uses large language models and machine learning to build high-performing algorithms.
As of 2026, the lab is based at the University of Tsukuba and the National Institute of Informatics.
Key terms
- information retrieval
- Technology for finding the items that match the information a user wants from large collections of documents and data.
- large language model
- A machine learning model trained on large amounts of text so that it can handle language.
- learning to rank
- A method that uses machine learning to decide the order of search results.
NewsLab news
A paper was accepted at CIKM 2026
A paper was accepted at SIGIR 2026
A doctoral student received the Committee Special Award at the 32nd Annual Meeting of the Association for Natural Language Processing
A master's student received the Sponsor Award (Recruit Co., Ltd.) at DEIM 2026
ResearchResearch themes
The Knowledge Acquisition System Lab centers on information retrieval and works on retrieval models and ranking, analysis of search user behavior, recommender systems, and more. Much of its research uses large language models and machine learning to build high-performing algorithms.
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MembersFaculty
The members of the Knowledge Acquisition System Lab consist of faculty members, researchers, students in the doctoral, master's, and undergraduate programs, and collaborators.As of 2026
- Associate ProfessorMakoto Kato
- Project Assistant ProfessorPham Phu Long
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Hard disk drive platter, Samsung MP0402H” Mk2010 / CC BY 4.0 (cropped)
- Searching Past Conversations During an Utterance: “Scheme of speech recognition system” IHEARu / CC BY-SA 4.0 (cropped)
- Related lab (
行動モデリング （山本 修平） ): “Diverse people using phones” Rawpixel Ltd / CC BY 2.0 (cropped) - Related lab (融合知能デザイン研究室): “Estimating Greenhouse Gas Concentration from Space using Machine Learning at Laboratoire LMD” Ecole polytechnique / Jérémy Barande / CC BY-SA 2.0 (cropped)
- Related lab (人間・情報・
技術研究室): “Reading on an e-book reader (Unsplash)” freestocks.org freestocks / CC0 (cropped) - Related lab (公共図書館論
（吉田 右子） ): “Library desk, Reading Room, Mitchell Building” Pix Magazine Photographer / Public domain (cropped)
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